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AM16/32B Relay Analog Multiplexer

' ***** ' "Jump" AM16/32B directly to Channel 6

Scan (100,mSec,0,1)

PortSet(5,1) ' Raise Reset line

Delay (0,5,mSec) ' Keep reset HI for 5 ms

PortSet(5,0) ' Reset line set LO (enters "B Addressing" mode)

Delay (0,3,mSec)

For i = 1 To 6 ' Pulse CLK line 6 times - addresses Channel 6

PortSet(6,1) ' Raise CLK

Delay (0,10,mSec)

PortSet(6,0) ' Drop CLK

Delay (0,10,mSec)

Next i

Delay (0,5,mSec)

PortSet(5,1) ' Raise Reset - selects Channel 6 (relays make contact)

NextScan

4.1.3 Ground

The AM16/32B has a ground lug that should be connected to earth ground via

an 8 AWG wire. This connection should be as short as possible. The ground

lug provides a path to dissipate surges that might propagate on a sensor’s

shield line. An 8-V, bi-polar transzorb connects shield ground to the ground

lug.

The AM16/32B “GND” terminal is connected to datalogger power ground.

The AM16/32B “GND” terminal is also connected to the CABLE4CBL or

MUXPOWER cable’s SHIELD and, via that, to datalogger power ground (see

Figure 3). If a separate power supply is used, the AM16/32B ground should

also connect to the separate supply’s ground (Figure 5). An AM16/32B

“COM

” terminal should connect to a datalogger ground terminal (“ ” or

“G”) via the cable that connects the COM terminals (see Section 4.2.1 and

Figure 6). The datalogger itself must connect to earth ground by one of the

methods described in the Installation and Maintenance Section of your

datalogger operator’s manual.

4.1.4 Power Supply

The AM16/32B requires a continuous 12 VDC power supply for operation.

The multiplexer's current drain is less than 210 microamps in the quiescent

state and is typically 6 to 11 milliamps at 12 VDC when active (see current

drain spec). The power supply is connected to the multiplexer terminals

labeled “12V” (+) and “GND”. Connect the “GND” wire first for safety.

In many applications it is convenient to power the AM16/32B from a

datalogger battery. For more power-intensive applications, an external,

rechargeable, 12 VDC, 60 Amp Hr source may be advisable. Lead-acid

supplies are recommended where solar or AC charging sources are available

because they handle well being “topped off” by constant charging. The

BPALK alkaline supply (12 Amp Hr) can be used to power the AM16/32B in

applications where the average system current is low, or where it is convenient

to frequently replace batteries. It is advisable to calculate the total power

requirements of a system and the expected longevity of the power supply based

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Campbell AVW1 Especificaciones Pagina 15

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